Rack and gear lifting unit for modular net cage and modular net cage

Abstract

The utility model discloses a rack and gear lifting unit for a modular net cage and the modular net cage. The rack and gear lifting unit comprises a lifting driving device, a climbing rack and a lifting mounting unit, the lifting driving device comprises a driving device and a gear, the lifting mounting unit comprises an annular mounting section, the annular mounting section is provided with an inner ring part and an outer ring part, the pile leg is sleeved with the inner ring part of the annular mounting section, the climbing rack is fixed to the pile leg, and the outer ring part of the annular mounting section is used for detachably mounting a net cage surface module; the lifting driving device is fixedly mounted on the lifting mounting unit, and a gear at the power output end of the driving device is in meshing transmission with a climbing rack on the pile leg. Through cooperation of the gear and rack climbing structure and the lifting mounting unit, the requirements for gear and rack meshing transmission space and stability can be met, the requirement for mounting space of the modular net cage can also be met, and operation smoothness and stability of the lifting unit in the whole breeding period are guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of marine engineering equipment, in particular to a rack and pinion lifting unit for a modular net cage and the modular net cage. Background Art

[0002] In recent years, the decline of offshore fishery resources due to overfishing and environmental pollution has become a global problem. Expanding aquaculture into deepwater and deep-sea waters has become an inevitable trend, with aquaculture gradually shifting from nearshore to deep-sea areas. As an effective marine aquaculture method, aquaculture cages have been widely used and developed around the world.

[0003] At present, aquaculture cages are mainly composed of a frame system and an anchoring system. The frame system is assembled from floating bodies such as buoys, and then fixed to a certain water layer height by an anchoring system. The above-mentioned structure aquaculture cages have poor wind and wave resistance and are generally set in areas with small winds and waves. They are easily affected by natural disasters such as typhoons. The self-elevating lifting cage is an advanced aquaculture cage that can be freely raised and lowered on the water surface and underwater according to aquaculture needs and environmental conditions. The self-elevating cage includes pile legs, a frame system, and a lifting transmission device. The frame system is movably installed on the pile legs. The frame system is controlled by the lifting transmission device so that the frame system can be freely raised and lowered along the pile legs on the water surface and underwater, realizing functions such as aquaculture in specific water layers and typhoon protection.

[0004] Currently, modular and standardized production methods are driving the industrialization and large-scale development of deep-sea aquaculture cages. This modularization and standardization of product production inevitably leads to a reduction in the size of individual modules, which places higher demands on the installation location of the lifting transmission. The lifting transmission is the most important power output component of the aquaculture cage and must maintain stable transmission while meeting the installation requirements of modular and standardized products. The coordination between the overall installation location of the lifting transmission and the modular connectors throughout the aquaculture cycle is extremely important and requires improvement. Utility Model Content

[0005] In order to overcome the deficiencies of the prior art, one of the objectives of the present invention is to provide a rack and pinion lifting unit for a modular cage.

[0006] A second object of the present utility model is to provide a modular cage comprising a rack and pinion lifting unit.

[0007] One of the purposes of the present utility model is achieved by adopting the following technical solution: a rack and pinion lifting unit for modular cages, comprising a lifting drive device, a climbing rack, and a lifting installation unit; the lifting drive device comprises a drive device and a gear installed at the power output end of the drive device, the lifting installation unit comprises an annular installation section, the annular installation section has an inner ring portion and an outer ring portion, the inner ring portion of the annular installation section is sleeved on the pile leg, the climbing rack is fixed on the pile leg, and the outer ring portion of the annular installation section is used for detachable installation of the cage surface module of the modular cage; the lifting drive device is fixedly mounted on the lifting installation unit, the gear at the power output end of the drive device and the climbing rack on the pile leg are engaged with each other for transmission, driving the lifting installation unit to perform lifting and lowering movements along the pile leg.

[0008] Optionally, there are two climbing racks, which are distributed on both sides of the pile leg in the radial direction; there are two lifting drive devices, which are fixedly installed on the lifting installation unit through a mounting base.

[0009] Optionally, the outer ring portion of the annular mounting section is provided with a mounting assembly for mounting at least one cage surface module; the mounting assembly and the two mounting bases are staggered and distributed on the same horizontal plane.

[0010] Optionally, the mounting base includes a mounting box and a connecting lug arranged at the bottom of the mounting box; the mounting box has a hollow chamber for mounting the gear and an opening for receiving the climbing rack on the pile leg, and the opening is connected to the hollow chamber; the driving device is mounted on the mounting box, and the gear on the driving device extends into the hollow chamber and engages with the climbing rack on the pile leg; the connecting lug is fixedly mounted on the lifting mounting unit.

[0011] Optionally, the connecting ears are two pieces, the lifting and mounting unit is provided with a support base extending from the inner ring portion to the outer ring portion, a plurality of crisscross reinforcing ribs are added in the support base, the two connecting ears are clamped on the support base, a plurality of crisscross reinforcing ribs are added in the support base, the two connecting ears are clamped on the support base, and are fixedly connected to the support base.

[0012] Optionally, a sling hanging lug is provided on the top of the installation box.

[0013] Optionally, the driving device includes a lifting motor, a coupling, a reduction gearbox, and a brake; the lifting motor is connected to the reduction gearbox through a coupling, and the gear is fixedly mounted on the transmission shaft of the reduction gearbox; the brake is mounted on one side of the lifting motor for emergency stopping of the lifting motor.

[0014] Optionally, the annular mounting joint includes an outer ring panel, an inner ring panel, a horizontal panel, and a reinforcement plate; the outer ring panel is arranged upright, and the inner ring panel is concentrically arranged on the inner side of the outer ring panel; multiple horizontal panels are horizontally supported between the outer ring panel and the inner ring panel; multiple horizontal panels divide the annular mounting joint into multiple hollow chambers; the reinforcement plate is arranged upright, and multiple reinforcement plates are radially distributed between the outer ring panel and the inner ring panel.

[0015] Optionally, a plurality of sliding sheets are provided on the inner wall of the inner ring panel, and the sliding sheets are evenly distributed on the inner ring panel, and the contact area between the sliding sheets and the pile legs is smaller than the contact area between the inner ring panel and the pile legs.

[0016] The second purpose of the present utility model is achieved by adopting the following technical solution: a breeding cage containing a lifting unit, comprising pile legs, a cage surface module, and the rack and gear lifting unit as described above; the rack and gear lifting unit is installed on the pile legs, and the cage surface module is installed between two adjacent pile legs through the rack and gear lifting unit.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. As modular and standardized production methods are more conducive to promoting the industrialization and large-scale development of deep-sea aquaculture cages, in order to solve the technical problems of smaller volume of single modules and limited installation space after modular and standardized production, this application improves the installation position and structure of the lifting transmission device. Specifically, by designing the inner and outer ring parts of the lifting installation unit, it can not only meet the needs of the meshing transmission space of the climbing gear to maintain transmission stability, but also meet the installation space requirements of the modular cage, thereby ensuring the smooth operation and stability of the rack gear lifting unit throughout the entire aquaculture cycle.

[0019] 2. This application utilizes a design in which two different connectors for cage installation and lifting transmission are staggered on the same horizontal plane. This design is rational, maximizing the effectiveness of the connectors in a very limited space and ensuring smooth operation of both. Preferably, the mounting bases are located on either side of the pile legs, forming a 180° distribution, while the cage mounting components are arranged at 90°, located on the same side of the pile legs. The angle between the mounting bases and the mounting components is 45°. This structural distribution is the most rational, resulting in high overall cage strength and high transmission stability for the lifting unit.

[0020] 3. This application is designed as a box through the installation base, which not only meets the needs of its own supporting strength, but also meets the needs of assembly and connection with multiple other functional components, including the installation avoidance position with the climbing rack, the installation position of the gear, the installation position of the lifting motor, and the connection ears assembled with the lifting installation node. The above-mentioned spatial structure is reasonably designed, with high strength and strong stability.

[0021] 4. The support seat of this application is a structurally reinforced drive device mounting location located on the lifting installation unit, with an inner ring extending toward the outer ring. Multiple crisscrossing reinforcement ribs are added to this location. This support seat structure not only meets the strength requirements of the annular installation section itself, but also meets the load-bearing capacity and ocean current impact forces required during lifting motion. This application designs two connecting lugs that respectively cover and clamp the support seats on both sides of the annular installation section. The two connecting lugs and the bottom of the installation box increase the contact area with the support seat, thereby improving the installation stability between the drive device and the lifting installation unit.

[0022] 5. During the hoisting process of the rack and pinion lifting unit, the drive device and the mounting base are pre-assembled into a whole. Then, by providing a lifting lug on the mounting box, the unit is hoisted to the annular mounting section by a crane and reinforced with fastening connectors such as bolts. The assembly process is simple and the alignment is convenient, which improves the assembly efficiency, reduces the assembly difficulty, and improves the operational stability of the lifting unit after assembly.

[0023] 6. The reduction gearbox of this application is equipped with a cycloid reducer and a planetary reducer. The cycloid reducer and the planetary reducer are sequentially arranged at the output end of the lifting motor, and the gear is mounted on the transmission shaft of the planetary reducer. This facilitates the lifting and lowering of the entire cage body through wired or wireless control, and the lifting and lowering are stable.

[0024] 7. The annular mounting joint body is designed with a variety of panels arranged in a crisscross pattern to divide the entire structure into multiple hollow chambers. This structure can not only meet the strength requirements of the annular mounting joint body itself, but also increase the torsional resistance of the structure, and meet the bearing capacity and ocean current impact force required during lifting and lowering movements. At the same time, the above structure is lighter and can reduce weight while ensuring strength.

[0025] 8. This application utilizes multiple sliding pieces protruding from the inner ring panel to prevent the inner ring of the lifting and mounting unit from fully contacting the legs during the lifting process. This reduces friction between the inner ring and the legs and prevents the legs from deforming slightly when in contact with the lifting and mounting unit. In severe cases, this can lead to irreversible deformation and even severe leg breakage due to excessive force, resulting in accidents. Furthermore, the sliding pieces are used to directly contact the legs, and multiple sliding pieces are evenly distributed on the outer wall of the legs, acting as track guides during the lifting and lowering of the cage body.

[0026] 9. The aquaculture cages of this application can be smaller in size, easier to install, and can achieve modular and standardized production, which will help promote the industrialization and large-scale development of deep-sea aquaculture cages. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural diagram of a rack and pinion lifting unit for a modular cage in a preferred embodiment 1 of the present invention;

[0028] Figure 2 This is a cross-sectional schematic diagram of a rack and pinion lifting unit for a modular cage in accordance with a preferred embodiment 1 of the present invention;

[0029] Figure 3 This is a structural diagram of the lifting drive device of the preferred embodiment 1 of the present utility model;

[0030] Figure 4 This is a structural diagram of a lifting installation unit in a preferred embodiment 1 of the present invention;

[0031] Figure 5 This is a cross-sectional schematic diagram of a lifting installation unit of a preferred embodiment 1 of the present utility model;

[0032] Figure 6 This is a structural diagram of the mounting base of the preferred embodiment 1 of the present utility model;

[0033] Figure 7 This is a structural diagram of a breeding cage in a preferred embodiment 2 of the present utility model;

[0034] Figure 8 for Figure 7 Enlarged schematic diagram of point A in the middle.

[0035] In the figure: 100, rack and pinion lifting unit; 1, lifting drive device; 11, drive device; 111, lifting motor; 112, coupling; 113, reduction gear box; 114, brake; 12, gear; 2, climbing rack; 3, lifting installation unit; 31, annular installation section; 311, outer ring panel; 312, inner ring panel; 313, horizontal panel; 314, reinforcement plate; 315, hollow chamber; 316, sliding piece; 32, inner ring part; 33, outer ring part; 34, installation assembly; 35, support seat; 4, installation base; 41, installation box; 42, connecting ear; 43, hollow chamber; 44, opening; 45, sling ear; 200, pile leg; 300, cage surface module. DETAILED DESCRIPTION

[0036] Below, the present invention is further described in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0037] Example 1 Rack and Pinion Lifting Unit

[0038] like Figure 1-6 As shown, a rack and pinion lifting unit 100 for a modular cage includes a lifting drive device 1, a climbing rack 2, and a lifting installation unit 3; the lifting drive device 1 includes a drive device 11 and a gear 12 installed at the power output end of the drive device 11, the lifting installation unit 3 includes an annular installation section 31, the annular installation section 31 has an inner ring portion 32 and an outer ring portion 33, the inner ring portion 32 of the annular installation section 31 is sleeved on the pile leg 200, the climbing rack is fixed on the pile leg 200, and the outer ring portion 33 of the annular installation section 31 is used for detachably installing the cage surface module 300 of the modular cage; the lifting drive device 1 is fixedly installed on the lifting installation unit 3, the gear 12 at the power output end of the drive device 11 and the climbing rack 2 on the pile leg 200 are engaged with each other for transmission, driving the lifting installation unit 3 to perform lifting and lowering movements along the pile leg 200.

[0039] As modular and standardized production methods are more conducive to promoting the industrialization and large-scale development of deep-sea aquaculture cages, in order to solve the technical problems of smaller volume of single modules and limited installation space after modular and standardized production, this application improves the installation position and structure of the lifting transmission device. Specifically, by designing the inner and outer ring parts 33 of the lifting installation unit 3, it can not only meet the needs of the meshing transmission space of the climbing gear to maintain transmission stability, but also meet the installation space needs of the modular cages, thereby ensuring the smooth operation and stability of the rack gear lifting unit 100 throughout the entire aquaculture cycle.

[0040] Optionally, there are two climbing racks 2 distributed on both sides of the pile leg 200 in the radial direction; there are two lifting drive devices 1, which are respectively fixedly installed on the lifting installation unit 3 through the installation base 4.

[0041] Optionally, the outer ring portion 33 of the annular mounting section 31 is provided with a mounting assembly 34 for mounting at least one cage surface module 300 ; the mounting assembly 34 and the two mounting bases 4 are staggered and distributed on the same horizontal plane.

[0042] The present application adopts the design of staggered distribution of two types of connectors for cage installation and lifting transmission, each with different functions, on the same horizontal plane. This structural design is reasonable, and the connectors with two functions are maximized in an extremely limited space, ensuring the smooth operation of both. Preferably, the mounting base 4 is located on both sides of the pile leg 200, with a distribution of 180 degrees, while the mounting assembly of the cage is distributed at 90 degrees, located on the same side of the pile leg 200. The angle between the mounting base 4 and the mounting assembly 34 is 45 degrees. This structural distribution is the most reasonable, the overall strength of the cage is high, and the transmission stability of the lifting unit is high.

[0043] Optionally, the mounting base 4 includes a mounting box 41 and a connecting ear 42 arranged at the bottom of the mounting box 41; the mounting box 41 has a hollow chamber 43 for mounting the gear 12 and an opening 44 for accommodating the climbing rack 2 on the pile leg 200, and the opening 44 is connected to the hollow chamber 43; the driving device 11 is installed on the mounting box 41, and the gear on the driving device 11 extends into the hollow chamber 43 and engages with the climbing rack 2 on the pile leg 200; the connecting ear 42 is fixedly mounted on the lifting mounting unit 3.

[0044] The present application is designed to be boxed by installing the base 4, which not only meets the needs of its own supporting strength, but also meets the needs of assembly and connection with multiple other functional components, including the installation avoidance position with the climbing rack 2, the installation position of the gear 12, the installation position of the lifting motor, and the connecting ear 42 assembled with the lifting installation node. The above-mentioned spatial structure is reasonably designed, with high strength and strong stability.

[0045] Optionally, the connecting ears 42 are two pieces, and the lifting and mounting unit 3 is provided with a support base 35 extending from the inner ring portion 32 to the outer ring portion 33, and a plurality of crisscross reinforcing ribs are added to the support base 35. The two connecting ears 42 are clamped on the support base 35 and fixedly connected to the support base 35.

[0046] The support seat 35 of this application is a mounting position for the drive device 11, located on the lifting installation unit 3, with an inner ring portion 32 extending toward an outer ring portion 33. This position is reinforced with a plurality of crisscrossing reinforcing ribs. This support seat 35 structure not only meets the strength requirements of the annular installation section 31 itself, but also meets the load-bearing capacity and ocean current impact forces required during lifting motion. This application designs two connecting lugs 42, which respectively cover and clamp the support seats 35 on both sides of the annular installation section 31. The two connecting lugs 42 and the bottom of the installation box 41 are used to increase the contact area between the support seat 35 and the lifting installation unit 3, thereby improving the installation stability between the drive device 11 and the lifting installation unit 3.

[0047] Optionally, a lifting lug 45 is provided on the top of the mounting box 41. During the hoisting process of the rack and pinion lifting unit 100, the drive device 11 and the mounting base 4 are pre-assembled into an integral unit. Then, by providing the lifting lug 45 on the mounting box 41, the unit is hoisted to the annular mounting section 31 by a crane and reinforced with fastening connectors such as bolts. This simplifies the assembly process and facilitates alignment, thereby improving assembly efficiency, reducing assembly difficulty, and improving the operational stability of the assembled lifting unit.

[0048] Optionally, the drive device 11 includes a lifting motor 111, a coupling 112, a reduction gearbox 113, and a brake 114. The lifting motor is connected to the reduction gearbox 113 via the coupling 112, and the gear 12 is fixedly mounted on the transmission shaft of the reduction gearbox 113. The brake is mounted on one side of the lifting motor and is used to stop the lifting motor in an emergency. If the lifting motor suddenly loses power, the brake is triggered to stop the motor, reducing the risk of the entire cage being raised or lowered. Optionally, the brake is a German PRECIMA brake, which is a spring-loaded dry friction electromagnetic brake.

[0049] The reducer 113 of the present application is equipped with a pendulum reducer and a planetary reducer. The pendulum reducer and the planetary reducer are arranged at the output end of the lifting motor 111 in sequence. The gear 12 is installed on the transmission shaft of the planetary reducer so as to drive the entire cage body to rise and fall through wired or wireless control, and the lifting and lowering is stable.

[0050] Optionally, the annular mounting joint 31 includes an outer ring panel 311, an inner ring panel 312, a horizontal panel 313, and a reinforcing plate 314; the outer ring panel 311 is arranged upright, and the inner ring panel 312 is concentrically arranged on the inner side of the outer ring panel 311; multiple horizontal panels 313 are horizontally supported between the outer ring panel 311 and the inner ring panel 312; multiple horizontal panels 313 divide the annular mounting joint 31 into multiple hollow chambers 315; the reinforcing plates 314 are arranged upright, and multiple reinforcing plates 314 are radially distributed between the outer ring panel 311 and the inner ring panel 312.

[0051] This annular mounting joint is designed with a plurality of panels arranged in a crisscross pattern to divide the entire structure into multiple hollow chambers 315. This structure can not only meet the strength requirements of the annular mounting joint 31 itself, but also increase the torsional resistance of the structure, and meet the bearing capacity and ocean current impact force required during lifting and lowering movements. At the same time, the above structure is more lightweight, which can reduce weight while ensuring strength.

[0052] Optionally, a plurality of sliding sheets 316 are provided on the inner wall of the inner ring panel 312 . The sliding sheets 316 are evenly distributed on the inner ring panel 312 , and the contact area between the sliding sheets 316 and the pile legs 200 is smaller than the contact area between the inner ring panel 312 and the pile legs 200 .

[0053] The present application provides a plurality of sliding pieces 316 protruding from the inner ring panel 312, so that the inner ring portion 32 of the lifting and mounting unit 3 does not completely contact the pile legs 200 during the raising and lowering process of the aquaculture cage. On the one hand, this reduces the friction between the inner ring portion 32 of the lifting and mounting unit 3 and the pile legs 200. On the other hand, it prevents the pile legs 200 from causing slight deformation when they come into contact with the lifting and mounting unit 3. In severe cases, irreversible deformation may occur, and even excessive force may cause the pile legs 200 to break, causing an accident. At the same time, the sliding pieces 316 are used to directly contact the pile legs 200. Multiple sliding pieces 316 are evenly distributed on the outer wall of the pile legs 200, playing a role in locating the track during the raising and lowering process of the cage body.

[0054] Example 2

[0055] As shown in Figures 7-8, a fish farming cage with a lifting unit includes pile legs 200, a cage surface module 300, and the rack and pinion lifting unit 100 as described in Example 1; the rack and pinion lifting unit 100 is installed on the pile legs 200, and the cage surface module 300 is installed between two adjacent pile legs 200 through the rack and pinion lifting unit 100. The structure of the rack and pinion lifting unit 100 is specifically described in the text of Example 1 and related appendixes. Figure 1-6 .

[0056] The aquaculture cages of the present application can be smaller in size and more convenient to install, and can realize modular and standardized production, which will help promote the industrialization and large-scale development of deep-sea aquaculture cages.

[0057] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A rack and pinion lifting unit for a modular cage, characterized in that: It includes a lifting drive device, a climbing rack, and a lifting installation unit; the lifting drive device includes a drive device and a gear installed at the power output end of the drive device, the lifting installation unit includes an annular installation section, the annular installation section has an inner ring portion and an outer ring portion, the inner ring portion of the annular installation section is sleeved on the pile leg, the climbing rack is fixed on the pile leg, and the outer ring portion of the annular installation section is used for detachable installation of the cage surface module of the modular cage; the lifting drive device is fixedly installed on the lifting installation unit, the gear at the power output end of the drive device and the climbing rack on the pile leg are engaged with each other for transmission, driving the lifting installation unit to perform lifting movement along the pile leg.

2. The rack and pinion lifting unit for modular cages according to claim 1, wherein: There are two climbing racks, which are distributed on both sides of the pile leg in the radial direction; there are two lifting drive devices, which are fixedly installed on the lifting installation unit through installation bases.

3. The rack and pinion lifting unit for modular cages according to claim 2, wherein: The outer ring portion of the annular mounting section is provided with a mounting assembly for mounting at least one net box surface module; the mounting assembly and the two mounting bases are staggered and distributed on the same horizontal plane.

4. The rack and pinion lifting unit for a modular cage according to claim 2 or 3, characterized in that: The mounting base includes a mounting box and a connecting lug arranged at the bottom of the mounting box; the mounting box has a hollow chamber for mounting the gear and an opening for receiving the climbing rack on the pile leg, and the opening is connected to the hollow chamber; the driving device is mounted on the mounting box, and the gear on the driving device extends into the hollow chamber and engages with the climbing rack on the pile leg; the connecting lug is fixedly mounted on the lifting mounting unit.

5. The rack and pinion lifting unit for modular cages according to claim 4, wherein: The connecting ears are two pieces, and the lifting installation unit is provided with a support base extending from the inner ring part to the outer ring part. A plurality of crisscross reinforcing ribs are added in the support base. The two connecting ears are clamped on the support base and fixedly connected to the support base.

6. The rack and pinion lifting unit for modular cages according to claim 4, wherein: The top of the installation box is provided with a hanger lug.

7. The rack and pinion lifting unit for modular cages according to claim 1, wherein: The driving device includes a lifting motor, a coupling, a reduction gear box, and a brake; the lifting motor is connected to the reduction gear box through the coupling, and the gear is fixedly mounted on the transmission shaft of the reduction gear box; the brake is mounted on one side of the lifting motor and is used to stop the lifting motor in an emergency.

8. The rack and pinion lifting unit for a modular cage according to claim 1, wherein: The annular mounting joints include an outer ring panel, an inner ring panel, a horizontal panel, and a reinforcement plate; the outer ring panel is arranged upright, and the inner ring panel is concentrically arranged on the inner side of the outer ring panel; multiple horizontal panels are horizontally supported between the outer ring panel and the inner ring panel; multiple horizontal panels divide the annular mounting joint into multiple hollow chambers; the reinforcement plate is arranged upright, and multiple reinforcement plates are radially distributed between the outer ring panel and the inner ring panel.

9. The rack and pinion lifting unit for a modular cage according to claim 8, wherein: The inner wall of the inner ring panel is provided with a plurality of sliding sheets, which are evenly distributed on the inner ring panel. The contact area between the sliding sheets and the pile legs is smaller than the contact area between the inner ring panel and the pile legs.

10. A breeding cage with a lifting unit, characterized in that: It comprises pile legs, a cage surface module, and a rack and pinion lifting unit according to any one of claims 1 to 9; The rack and pinion lifting unit is installed on the pile legs, and the cage surface module is installed between two adjacent pile legs through the rack and pinion lifting unit.

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